Asked by Mazhar

In a class, 2/7 of the pupils are girls. 1/2 of the girls and 1/3 of the boys in the class wear glasses. If 10 boys wear glasses, how many of the girls wear glasses?
Answered by Reiny
total number of students ---- x
number of girls = (2/7)x
number of boys = (5/7)x

number of girls with glasses = (1/2)(2/7)x = (1/7)x
number of boys with glasses = (1/3)(5/7)x = (5/21)x

given: (5/21)x = 10

solve for x, and sub into my definition
Answered by teta
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